CN102508289B - pulse coded vibrator - Google Patents

Abstract

The invention relates to a pulse code vibrator. The bottom of the support frame is connected by the base, the lower pressure plate is installed at the lower third of the support frame, the coil barrel and the coil are installed between the upper and lower pressure plates, and the fastening screw passes through the positioning sleeve and the upper pressure plate to connect with the support frame. The coding controller is connected with the coil, the adjusting screw supporting cylinder is installed in the middle of the upper platen, and the adjusting screw is connected with the adjusting screw supporting cylinder. The coded shock sequence generated by the pulse coded vibrator has ideal pseudo-random characteristics, which can significantly reduce the number of shocks and improve construction efficiency. The original seismic records obtained by coded excitation can be equivalent to high-energy single-pulse source signals after correlation decoding operations , with higher resolution and signal-to-noise ratio for seismic exploration. The mechanical part of the vibrator can be quickly disassembled and assembled, which is convenient for transportation and construction. It is suitable for urban seismic exploration, mountain seismic exploration and shallow engineering seismic exploration. It has a simple structure, convenient transportation and high stability.

Description

pulse coded vibrator

Technical field:

The invention relates to an impact type vibrator for seismic exploration, in particular to a pulse coded vibrator for shallow seismic exploration.

Background technique:

The seismic source is the source of the signal in seismic exploration. The seismic sources in marine seismic exploration mainly include electric spark source and air gun source. In land seismic exploration, explosive source has been used as the main source form. However, there are many disadvantages in the explosive seismic source. Firstly, due to the serious damage to the environment, the explosive seismic source is not suitable for use in cities, and high compensation fees are often required to be used in farmland; secondly, in order to effectively transmit the excited energy Underground, the seismic source of explosives usually needs to be excavated after drilling and landfilling. The expensive drilling costs make the cost of seismic exploration high; thirdly, in mountainous areas with exposed bedrock or complex terrain, it is not suitable to use explosives due to the difficulty of drilling. source. In recent years, the vibroseis system (Vibroseis) based on continuous frequency sweep has been gradually applied in land seismic exploration, among which the hydraulic vibroseis system is mainly used in deep oil and gas resource exploration. Electromagnetic vibroseis systems have not been widely used due to the limitation of inherent characteristics such as small output. In shallow engineering seismic exploration, the sledgehammer is the simplest seismic source, but the sledgehammer source usually adopts the excitation method of vertical stacking in order to overcome random noise. Poor signal consistency, high labor intensity, and low construction efficiency are the weaknesses of the sledgehammer source. The Mini-SOSIE source system uses a relatively light rammer as the source, forms a random pulse sequence through multiple excitations over a long period of time, and uses correlation decoding operations to obtain decoded seismic records that are approximately equivalent to conventional single-shot records. The disadvantage of this method is that, first of all, in order to obtain an ideal random shock sequence, hundreds or even thousands of shocks are required, and the receiving time can usually reach several minutes. Conventional seismographs cannot meet the requirements and reduce the construction cost. Exploration efficiency increases construction costs. Secondly, it is difficult to obtain an ideal random sequence due to the limitations of the inherent characteristics of the rammer. Therefore, the correlated noise with strong energy will have a great impact on the signal-to-noise ratio of seismic records.

Invention content:

The object of the present invention is to provide a pulse code vibroseis to address the shortcomings of the above-mentioned prior art.

The purpose of the present invention is achieved through the following technical solutions:

The pulse code vibrator is equipped with three adjustment screws 23 through the thread on the base 19, the base 19 is connected with the bracket connector 21 through the fixing screw 24, the bracket connector 21 is connected with the bottom end of the support frame 8 by bolts or welding, the base 19 Connect with the anvil cover 20 by screws, the anvil 22 is slidingly fitted with the base 19, the bottom end of the anvil 22 is provided with a sensor slot 27, the anvil 22 is statically fitted with the copper anvil 18, and at the lower third of the support frame 8 One of them is provided with more than one height adjustment hole 26, and the lower pressure plate 16 is installed through the height adjustment hole 26 and the fixing screw 24. The coil lower cover 15 is installed on the pressure plate 16, and the coil barrel 11 is installed on the coil lower cover 15, and the coil barrel 11 is equipped with a coil 12, the center of the coil 12 is equipped with a punch 17, the coil upper cover 10 is pressed on the coil barrel 11 and the coil 12, the upper pressing plate 9 is pressed on the coil upper cover 10, and the fastening screw 6 passes through the positioning sleeve 7 Connect with the upper platen 9 and the support frame 8, the upper platen 9 is provided with a wire hole 25, the wire 13 of the encoder controller 14 passes through the wire hole 25 and is connected with the coil 12, and the adjustment screw support cylinder 2 is mounted on the upper platen 9 by bolts In the middle of the upper cover of the adjustment screw support cylinder 2, there is a thread in the middle, the adjustment screw 1 is connected with the adjustment screw support cylinder 2 through the thread, the adjustment screw 1 is connected with the limit chute 5 through the limit screw, and the limit screw is connected with the limit The chute 5 is slidably matched, and the limit chute 5 is connected with the buffer head 4 by a screw, and a spring 3 is arranged between the upper end of the buffer head 4 and the lower end of the adjustment screw 1 to form.

The hole spacing of the height adjustment holes 26 is 2-3cm, and the thickness of the positioning sleeve 7 is equal to the hole spacing.

Anvil 22 is a flat anvil or a round anvil.

Beneficial effects: the coded shock sequence generated by the pulse coded vibroseis has ideal pseudo-random characteristics, which can significantly reduce the number of shocks and improve construction efficiency. The original seismic records obtained by the coded excitation can be equivalent to large energy unit The pulse source signal has high seismic exploration resolution and signal-to-noise ratio. The mechanical part of the vibrator can be quickly disassembled and assembled, which is convenient for transportation and construction. It is suitable for urban seismic exploration, mountain seismic exploration and shallow engineering seismic exploration. It has a simple structure, convenient transportation and high stability.

Description of drawings:

Accompanying drawing 1 is the structural diagram of the pulse code vibrator.

1 Adjusting screw, 2 Adjusting screw support cylinder, 3 Spring, 4 Buffer head, 5 Limit chute, 6 Fastening screw, 7 Positioning sleeve, 8 Support frame, 9 Upper pressure plate, 10 Coil upper cover, 11 Coil barrel, 12 Coil, 13 wires, 14 coding controller, 15 coil lower cover, 16 lower pressure plate, 17 hammer, 18 copper anvil, 19 base, 20 anvil cover, 21 bracket connector, 22 anvil, 23 adjusting screw, 24 Fixing screws, 25 coil holes, 26 height adjustment holes, 27 sensor card slots.

Detailed ways:

Below tuberculosis accompanying drawing and embodiment are described in further detail:

Example 1

The pulse code vibrator is equipped with three adjustment screws 23 through the thread on the base 19, the base 19 is connected with the bracket connector 21 through the fixing screw 24, the bracket connector 21 is connected with the bottom end of the support frame 8 by bolts or welding, the base 19 Connect with the anvil cover 20 by screws, the flat anvil 22 is slidingly fitted with the base 19, the bottom end of the flat anvil 22 is provided with a sensor card slot 27, the flat anvil 22 is statically fitted with the copper anvil 18, and on the support frame 8 The lower third is provided with more than three height adjustment holes 26, the hole spacing is 3cm, the lower pressure plate 16 is installed through the height adjustment holes 26 and the fixing screws 24, the coil lower cover 15 is installed on the pressure plate 16, and the coil lower cover 15 is installed There is a coil barrel 11, a coil 12 is installed in the coil barrel 11, a hammer 17 is installed in the middle of the coil 12, the coil upper cover 10 is pressed on the coil barrel 11 and the coil 12, the upper pressing plate 9 is pressed on the coil upper cover 10, fastened The screw 6 passes through the positioning sleeve 7 and the upper pressing plate 9 and is connected with the support frame 8. The thickness of the positioning sleeve 7 is 3 cm. The upper pressing plate 9 is provided with a wire hole 25, and the wire 13 of the encoding controller 14 passes through the wire hole 25 and the coil 12 connection, the adjustment screw support cylinder 2 is installed in the middle of the upper platen 9 through bolts, the middle of the upper cover of the adjustment screw support cylinder 2 is provided with threads, the adjustment screw 1 is connected with the adjustment screw support cylinder 2 through the thread, and the adjustment screw 1 passes through the limit The screw is connected with the limit chute 5, and the limit screw is slidingly matched with the limit chute 5, and the limit chute 5 is connected with the buffer head 4 through a screw, and a spring is arranged between the upper end of the buffer head 4 and the lower end of the adjustment screw 1 3 composition. Adjusting screw 23 is used for adjusting base 19 heights.

The encoder controller 14 works to generate a pulse code control signal, the control coil 12 generates electromagnetic force to lift the hammer 17, and the hammer 17 lifts to the highest point to compress the spring 3 connected to the buffer head 4, and the encoder controller 14 turns off the coil current to cut off Magnetic field, the impact hammer 17 accelerates downward under the action of gravity and spring, the impact hammer 17 hits the copper anvil 18 to generate an impact pulse, and the impact energy propagates underground through the flat anvil 22 to form a pulse source signal. The system completes the scanning impact process in which the impact frequency changes linearly under the action of the coded control signal.

Example 2

The pulse code vibrator is equipped with three adjustment screws 23 through the thread on the base 19, the base 19 is connected with the bracket connector 21 through the fixing screw 24, the bracket connector 21 is connected with the bottom end of the support frame 8 by bolts or welding, the base 19 Connect with the anvil cover 20 by screws, the round anvil 22 is slidingly fitted with the base 19, the bottom end of the round anvil 22 is provided with a sensor slot 27, the round anvil 22 is statically fitted with the copper anvil 18, and the The lower third of the frame 8 is provided with more than five height adjustment holes 26, the hole spacing is 3cm, the lower pressure plate 16 is installed through the height adjustment holes 26 and the fixing screws 24, and the coil lower cover 15 is arranged on the pressure plate 16, and the coil lower The coil barrel 11 is installed on the cover 15, the coil barrel 11 is equipped with the coil 12, the hammer 17 is installed in the middle of the coil 12, the coil upper cover 10 is pressed on the coil barrel 11 and the coil 12, and the upper pressing plate 9 is pressed on the coil upper cover 10 On, the fastening screw 6 passes through the positioning sleeve 7 and the upper pressing plate 9 to connect with the support frame 8, the thickness of the positioning sleeve 7 is 2cm, the upper pressing plate 9 is provided with a wire hole 25, and the wire 13 of the encoding controller 14 passes through the wire The hole 25 is connected with the coil 12, and the adjustment screw support cylinder 2 is installed in the middle of the upper platen 9 through bolts, and the middle of the upper cover of the adjustment screw support cylinder 2 is provided with threads, and the adjustment screw 1 is connected with the adjustment screw support cylinder 2 through threads, and the adjustment screw 1 is connected with the limit chute 5 through the limit screw, the limit screw and the limit chute 5 are slidingly matched, the limit chute 5 is connected with the buffer head 4 through the screw, the upper end of the buffer head 4 and the lower end of the adjustment screw 1 Between is equipped with spring 3 to form. Adjusting screw 23 is used for adjusting base 19 heights.

The encoder controller 14 works to generate a pulse code control signal, the control coil 12 generates electromagnetic force to lift the hammer 17, and the hammer 17 lifts to the highest point to compress the spring 3 connected to the buffer head 4, and the encoder controller 14 turns off the coil current to cut off Magnetic field, the impact hammer 17 accelerates downward under the action of gravity and spring, the impact hammer 17 hits the copper anvil 18 to generate an impact pulse, and the impact energy propagates underground through the round anvil 22 to form a pulse source signal. The system completes the scanning impact process in which the impact frequency changes linearly under the action of the coded control signal.

Claims (2)

1. controlled source of pulse codes, it is characterized in that: be to be equipped with three by base (19) by screw thread to adjust screw (23), base (19) is connected with support connector (21) by gib screw (24), support connector (21) is connected with bracing frame (8) bottom by bolt or welding, base (19) is connected with hammering block lid (20) by screw, hammering block (22) is slidably matched with base (19), hammering block (22) bottom is provided with sensor draw-in groove (27), hammering block (22) is connected with copper anvil block (18) stationary fit, be provided with height adjustment hole (26) more than at lower 1/3rd places of bracing frame (8), the pitch of holes of height adjustment hole (26) is 3cm, by height adjustment hole (26) and gib screw (24), lower platen (16) is housed, coil lower cover (15) is housed on pressing plate (16), coil tube (11) is housed on coil lower cover (15), coil tube (11) is in-built coil (12), block stamp (17) is housed in the middle of coil (12), coil upper cover (10) is fitted on coil tube (11) and coil (12), top board (9) is pressed on coil upper cover (10), holding screw (6) passes locating sleeve (7) is connected 9 with top board) be connected with bracing frame (8), the thickness of locating sleeve (7) equates with pitch of holes, top board (9) is provided with cable-through hole (25), the wire (13) of coding controller (14) passes cable-through hole (25) and is connected with coil (12), adjust screw rod support tube (2) and be contained in the centre of top board (9) by bolt, adjust the middle screw thread that is provided with of upper cover of screw rod support tube (2), adjusting screw (1) is connected with adjustment screw rod support tube (2) by screw thread, adjusting screw (1) is connected with limit sliding chutes (5) by stop screw, stop screw and limit sliding chutes (5) are slidably matched, limit sliding chutes (5) is connected with buffer head (4) by screw, spring is housed between the lower end of the upper end of buffer head (4) and adjustment screw (1), and (30 consist of.

2. according to controlled source of pulse codes claimed in claim 1, it is characterized in that: hammering block (22) is tack hammering block or round end hammering block.

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